If you are going to raise the cage suggest you use solid metal plates rather than a box sections. Yes they will weigh more but will be stronger than a box in this application, although if the ends of the box are closed it will be fairly strong. What kind of welding are you doing? I would not use gas for this purpose.
If the cage was designed by a reputable company for your specific car I would hesitate to modify it with the possible excetion of a larger plate under the floor. Whatever you do, use top quality bolts, washers and locking nuts and check them regularly. If the nuts and bolts supplied are only grade 5 (automotive) buy better ones. If you do raise the cage you will need longer bolts anyway. Make sure all holes are exact so there is no slop. Military spec hardware (aircraft) bolts are exact. Grade 5 are not. If you are lucky you may have an aircraft surplus outlet near and you won't have to pay through the nose for your hardware.
Old fart race mechanic here.
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